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nvgpu: gp10b: remove EMC floor when GPU Fmin

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Remove EMC floor when GPU frequency is Fmin. At Fmin,
we most likely require a very low memory bandwidth.
At Fmin on load, actmon should sufficiently scale EMC
and hence not bottlenecking GPU.

Bug 1850297

Change-Id: I98b9dae648ea28910d534a9286ce2e9e91ea5fec
Signed-off-by: Cyril Raju <craju@nvidia.com>
Reviewed-on: http://git-master/r/1284572
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Cyril Raju
2017-01-12 17:05:26 -08:00
committed by mobile promotions
parent f15a86f265
commit c58da17d13
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
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@@ -312,7 +312,14 @@ static void gp10b_tegra_postscale(struct device *pdev,
gk20a_dbg_fn("");
if (profile && !gp10b_tegra_is_railgated(pdev)) {
emc_rate = (freq * EMC_BW_RATIO * g->emc3d_ratio) / 1000;
unsigned long emc_scale;
if (freq <= gp10b_freq_table[0])
emc_scale = 0;
else
emc_scale = g->emc3d_ratio;
emc_rate = (freq * EMC_BW_RATIO * emc_scale) / 1000;
if (emc_rate > tegra_bwmgr_get_max_emc_rate())
emc_rate = tegra_bwmgr_get_max_emc_rate();